Statistical Model for Differential Abortion Deaths. In 1969, Tietze de->ed a mathematical model to calculate the relative risks to life associated contraception (highly effective—the pill—and moderately effective meth- pregnancy, and abortion. The data summarized in Table 12 illustrate the difference between the risks of mortality from legal or medical abortion is criminal abortion. The mortality risks of medical abortion are unitedly slight, and, in fact, equal the risks reported for oral contraception ;r 100,000 users). Tietze concludes that the most rational procedure for regulation of fertility is the development of a safe, though less than percent-effective, program of contraception and the creation of a permis-atmosphere to allow for abortion under hospital operating-room condi- (94). TABLE 12 ithematical Model for Maternal Mortality from Pregnancy, Induced Abortion, and Contraception: Illustrative Annual Rates of Pregnancies and of Deaths Associated with Contraception, Pregnancy, and Induced Abortion per 100,000 Women of Reproductive Age in Fertile Unions Pregnancies Deaths Dntraception, no induced abortion sntraception, all pregnancies x>rted out of hospital Dntraception, aborted in hospital iy effective contraception [pill], D induced abortion irately effective contraception, 0 induced abortion irately effective contraception, 1 pregnancies aborted out of ospital irately effective contraception, sorted in hospital 40,000-60,000 100,000 100,000 100 11,800-13,000 14,300 14,300 8-12 100 3 3 2.5 14.3 0.4 ource: Tietze (94).ith crii abortion. The study reports that eighteen of forty-two patients with s shock associated with criminal abortion died, producing a case fatality of 43 percent.